Chain-grate stoker.



W. A. JONES.

CHAIN GRATE STOKER.

APPLIUATION mun 21:13.3, 191s Patented Nov. 17, 1914.

6471 TTOR/VEY/ WITNESSES:

W. A. JONES.

CHAIN GRATE STOKER.

APPLICATION FILED rm. a, 1913.

Patented Nov. 17, 1914.

2 SHEBTS-SHEET 2.

IN VfN TOR m; ATTORNEY s.

TWITTER?) ti TATlilS PATlEN T OFFTCE.

WILLIAM A. JONES, OF WEST NEW BRIGHTON, NEW YORK, ASSIGNOR TO THE BAR- COCK & 'WILCOX COMPANY, OF BAYONNE. NEW JERSEY, A CORPORATION OF NEW JERSEY.

' CHAIN-GRATE STOKER.

Application filed February 3, 1913.

To all 107mm it may concern Be it known that l, l Vnimam A. Jones, a citizen of the llnited "Watts, residing at West New Brighton, Staten Island, inthe county of Richmond and State of New York, have invented certain new and useful In'iprovements in Cl'iain-Grate Stokers, of which the following is a specification.

My invention relates to that class of travcling grates having a grate surface in the form of an endless belt composed of so called grate links, or of lateral bars attached to endless chains. In this class of grates both the upper run which forms the grate surface, and the lower or return run are carried on rollers, and the siftings of line coal through the upper run fall upon and pass through the lower run and are deposited below the grate throughout its length, and it is somewhat troublesome to connect them for disposal. To prevent such deposits over a large area I have introduced a plate upon which the lower run slides or drags during its return to the front of the Stoker, the siftings from the upper run falling upon this plate and being drawn to the front and falling over its forward end to afford convenient removal to be used as fuel if so desired.

The invention will be understood by reference to the accompanying drawings in which- Figure 1 is a side elevation, with certain parts in section, of a traveling grate embodying my invention; Fig. 2, a front elevation with a part in section on the plane of the line 2- 2 of Fig. l, and a part in section on the plane of the line 3--3 of Fig. l; and Fig. 3, a. detail view.

Similar reference numerals indicate similar parts in the several views.

Referring to the drawings, the numeral 1 designates the side frames of the stoker said frames being held in position by cross members ll. Supported in suitable boxes on the frame are wheels 3 adapted to travel on rails 4 whereby the stolcer may be moved into and out of the furnace. Also supported in boxes on the side frames are shafts 5 and 6 on which shafts are mounted the usual sprocket wheels 7 and 8, the former being on the front shaft and the latter on the rear shaft. The g1 rte surface is made up of interlocking links9 held in position by rods 10. the grate surface constituting an endless web or belt. The upper run of the grate is carried upon invention.

Patented Nov. 17, 1914. Serial No. 745,776.

rollers 11 which are supported on rods having hearings in the side frames as shown in Fig. 3, the said rollers 11 being distributed between the front and rear sprocket wheels.

The support for the return run consists of a metal plate 12 attached to the underside of the side frames 1, said plate preferably having strengthening ribs 13. This plate extends the width of the stoker, and from front to rear substantially the distance between the sprocket wheels 7 and 8. A roller l-L may be placed at the rear of the stoker in advance of the rear edge of plate 12, and a similar roller 15 may be placed at the front of the stoker beyond the front edge of plate 12. This plate carries the whole weight of the return run.between rollers 14 and 15, and any coal or ash falling through the upper run is caught upon it, and by the sliding movement of the lower run the siftings are carried to the front of the stolccr and deposited over the forward edge of plate 12 in a windrow parallel with the stoker front. The plate 12 constitutes in effect a floor upon and over which the return run is drawn, such floor, however, being a part of the stoker structure. By the use of such floor I am able to do away with the usual rollers for the return run, and to provide means to receive the siftings for their convenient disposal at the fron of the furnace.

The ash and fuel refuse are dropped from the grate as the latter passes over the rear sprocket wheels into suitable pit in as indirated in Fig. 1.

The stoker is run into the furnace on the rails t as is usual, and the fuel fed thereto by any suitable means, such as illustrated in the drawings, which I have not described as such parts are not a part of the present The above described feature of a plate supporting the return runpf the grate is also of value in a stoker arranged for blast.

Stokcrs have been constructed in which blast compartments are provided between the runs of the grate, means being provided to admit the blast at one side of the stoker, and a hopper beneath each compartment to receive the siftings. By using the plate 19 l considerably reduce the cost of the stoker as If ani able "to dispense with the hoppers. in the constriu-tirm shown, the cross mombcrs 2, above referred to. are secured to the side training and divide the space between that! 7 the grate runs into a phiralit of chambers into which the olast may be introduced through the openingslti. These openings are adapted to be connected. to the source of blast and controlled by valves to regulate the pressure in the compartments as desired. A loose sealing piece 17 is mounted on the top of each of the vertical cross membersil, said pieces resting against the rollers 11. At the bottom of each crosslnember is a clip 18 which rests upon the top of the return run of'the grate, these clips extending toward the rear of the stoker. 'The cross members Qwith their sealing pieces at the top and bottom of each, and plate 12, form a series oi closed chambers in which an air pressure may be maintained for the purpose of producing a iorced blest under the grate. This arrangement does TlOlhlllflkG a hermetrically sealed chamber, as there is necessarily a certain amount of leakage between the links of the chain, but this is so small. to be negligible.

Vvhat l1 claim and desire to secure by Letters Patent of tiefUnited States is.'

1. An endless traveling grate comprising side frames, rollers carried by said frames and forming supports for the upper run of the grate, a plate attached to the side frames and extending substantially from the front to the rear oi theigrate, said plate constituting a support upon which the lower or return run of thel grate rests and along i I a i i o a which 1* isdrawn, and transverse partitions dividing the spacebetween the upper and lower runs of the grate into a plurality of compartnoents,

said side frames having openings through which an air blast may be introduced into said compartments.

2. An endless treveling'grate comprisingside frames, rollers carried by said frames and formingsupports for the upper run of the grate, aplate attached to the side frames and extending substantially from the front to the rear of the grate, said plate c0nstitut.

ing it support uponwhich the lower orre turn run of the grate'rests end along-Which it is drawn, transverse partitions dividing the space between the upper and lower runs of thegrate into a plurality of conipalrt ments, said side frames having 'bpening's through which an air blast inay be introduced into said compartments; sealingmem scribing Witnesses. v

' WILLIAM A. JONES. Witnesses:

WILLIAM lllUNRO Gnnnir, LEMUEL D. Bnnnrmiu.

v In testimony whereof have hereuntowm signed my name in the presence of two sub- 

